Can you digitize the analog signal and output it via RS-232 (serial port)? If so, take a look at the dataforth LDM70
http://www.dataforth.com/catalog/pdf/Ldm70.pdf
According to the specs, this modem can be used to transmit data up to 12 miles using a twisted pair cable at up to 57.6K baud...
I am getting some very good feedback, but I realize that I need to provide a little more information about my application in order to get more specific information.
I need to control a DPDT mechanical relay to switch a 35 V, 500 mA constant current programmable supply between 2 different...
Does anyone know of a relay or other component that will allow me to switch up to 500 mA at 30V using a 5V, 10mA control signal from a digital output?
Thanks!
LLRelease
If your DAQ card has a general purpose counter output, you could use it to drive a mosfet and vary the fan speed by varying the duty cycle of the counter output. If you only need on/off control, you could use a 5V digital output to drive a transistor. I have used both of these approaches with...